Cronômetro - Timer

Arquivo: JavaTeste.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class JavaTeste extends JFrame {

   private JLabel maximo;
   private JTextField posicao;
   private JButton play_pause;
   private JButton stop;
   private JButton alterar;

   int pos = 0;
   int max = 100;
   int tempo = 1000;
   boolean Xplay_pause = false;
   String play_pause_text = "Play";

      public JavaTeste() {

      super("Formulario");
      this.setSize(400,200);
      this.setLocation(50, 100);

      Container ct = this.getContentPane();
      ct.setLayout(null);

      play_pause = new JButton("Play");
      play_pause.setBounds(0,0,100,25);
      ct.add(play_pause);

      stop = new JButton("stop");
      stop.setBounds(101,0,100,25);
      ct.add(stop);

      posicao = new JTextField("0");
      posicao.setBounds(202,0,100,25);
      ct.add(posicao);

      maximo = new JLabel("Limite maximo: "+max);
      maximo.setBounds(303,0,300,25);
      ct.add(maximo);

      alterar = new JButton("Alterar");
      alterar.setBounds(0,26,100,25);
      ct.add(alterar);

      Image Icone = Toolkit.getDefaultToolkit().getImage("icon.gif");
      setIconImage(Icone);

      this.setVisible(true);

      alterar.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            xStop();
            String _maximo = JOptionPane.showInputDialog("Limite maximo: "+max);
            if(!(_maximo.equals("") || _maximo.equals(null))){
                int xMax = xMaximo(Integer.parseInt(_maximo));
                maximo.setText("Limite maximo: "+xMax);
            }

            String _posicao = JOptionPane.showInputDialog("posicao: "+pos);
            if(!(_posicao.equals("") || _posicao.equals(null))){
                int xPos = xPosicao(Integer.parseInt(_posicao));
                posicao.setText(""+xPos);
            }

            String _tempo = JOptionPane.showInputDialog("tempo: "+tempo);
                if(!(_tempo.equals("") || _tempo.equals(null))){
                xTempo(Integer.parseInt(_tempo));
            }
      }});

      stop.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {

            int xPos = xStop();
            posicao.setText(""+xPos);

      }});

      play_pause.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {

            play_pause.setText(getPlayPause());

      }});

      this.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent e) {
            System.exit(0);
      }});

   }
   public static void main(String[] args) {
      new JavaTeste();
   }
public int xStop(){
    pos = 0;
    Xplay_pause = false;
    play_pause.setText("Play");
    return pos;
}

public int xMaximo(int x){
    max = x;
    return max;
}

public int xPosicao(int x){
    pos = x;
    return pos;
}

public int xTempo(int x){
    tempo = x;
    return tempo;
}

public String getPlayPause(){
    if(Xplay_pause == false){
        Xplay_pause = true;
        getPlay();
        play_pause_text = "Pause";
    } else {
        Xplay_pause = false;
        play_pause_text = "Play";
    }

    return play_pause_text;

}

public void getPlay(){
    Thread runner = new Thread(new Runnable() {
        public void run() {
            while(Xplay_pause == true) {
                pos = pos + 1;
                try {
                    Thread.sleep(tempo);
                } catch (Exception ex) {}
                if(pos > max){
                    Xplay_pause = false;
                    pos = 0;
                }
                posicao.setText(""+pos);
            }
        }});
    runner.start();
}

}